Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues	$ 25,212	$ 22,622
Costs and expenses:
Cost of sales	13,220	11,466
Selling, general and administrative	8,994	7,951
Research and development	506	402
	22,720	19,819
Operating income	2,492	2,803
Interest expense	(25)	(40)
Interest income		1
Other income (expense)	21	(40)
Income before income taxes	2,488	2,724
Income tax expense	(945)	(1,385)
Net income	$ 1,543	$ 1,339
Net income per common share:
Basic (in Dollars per share)	$ 0.07	$ 0.06
Diluted (in Dollars per share)	$ 0.06	$ 0.05
Weighted-average number of common shares outstanding:
Basic (in Shares)	23,591,000	24,214,000
Diluted (in Shares)	24,261,000	24,669,000